bump: version 3.0.1

Synchronize version across all files:
- Directory.Build.props → 3.0.1
- compose.yaml → gmrelay-bot/web/discord-bot:3.0.1
- deploy.yml → VERSION: 3.0.1
- NavMenu.razor → v3.0.1
- DiscordProjectStructureTests → 3.0.1

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/GmRelay.Web/Components/Layout/NavMenu.razor

@@ -73,7 +73,7 @@
                     </button>
                 </form>
 
-                <div class="nav-version">v3.0.0</div>
+                <div class="nav-version">v3.0.1</div>
             </div>
         </Authorized>
         <NotAuthorized>